Zn-Mn和Zn-Ti二元合金热力学性质

摘要

在考虑理论计算合金形成热的各种影响因素的基础上， 用Miedema 二元合金生成热模型计算了彩色热镀锌用Zn-Mn和Zn-Ti二元溶液的混合焓ΔHmix 与添加元素的摩 尔分数之间的关系； 利用Tanaka近似关系式及一些基本热力学关系计算了上述两个二元体 系 的过剩混合熵ΔSEmix、 过剩混合自由能ΔGEmix及各组元的 活度。 结果表明， Zn-Mn和Zn-Ti两溶液相对于理想溶液都有很大的负偏差。%Considering different factors that affect the form ation heat of binary alloys， the relationship among Zn-Mn and Zn-Ti formation heat s a nd mole fraction of additives were obtained by Miedema's mode; ΔSEmix ， ΔGEmix and activities of the two systems were calculated by Tanaka model and some relations h ips of thermodynamics. The results indicate that Zn-Mn and Zn-Ti solutions hav e a rather large negative deviation relative to ideal solution.